The EIA310D standard was first published in 1999 and has undergone several revisions since then. The latest revision, EIA310D (2016), is the most current version of the standard. The standard was developed to provide a uniform method for measuring and specifying the performance of capacitors, ensuring interoperability and compatibility among components from different manufacturers.
While the standard defines the location of the holes, it allows for different types of mounting rail designs. The three most common variations found in data centers include:
The key takeaway is that while the managing organizations have changed, the physical specifications laid out in the 1992 EIA-310-D document have remained the bedrock of rack standardization.
Found in legacy clearance-hole racks, these require a clip nut or a bolt and nut combination to secure the equipment. Evolution to CEA-310-E eia310d standard pdf
It's crucial to understand that . Compliance is not enforced by any government or regulatory body; manufacturers are free to choose whether to follow it. However, the overwhelming majority do so to ensure their equipment is compatible with the global market.
The Electronic Industries Alliance (EIA) standard, officially titled , is the definitive North American (and de facto global) specification for the physical dimensions of 19-inch racks.
While we strongly encourage you to purchase the official PDF from ANSI or IHS Markit to support the standards ecosystem, the critical engineering data is publicly known and widely reproduced. Whether you are a data center architect, a maintenance technician, or a student of industrial design, understanding EIA-310-D equips you with the foundational knowledge that holds the digital world together—one 0.5-inch hole spacing at a time. The EIA310D standard was first published in 1999
If you are manufacturing a new rack system, use EIA-310-F . If you are maintaining an existing rack or verifying compatibility with a legacy server, EIA-310-D is your reference.
If you are searching for the PDF, you likely need the actual numbers. Here are the core specifications codified in EIA-310-D:
Because of this uneven 0.625" - 0.625" - 0.500" distribution, mounting equipment requires careful alignment. If you attempt to mount a server across the boundary of a Rack Unit rather than inside a single unit's boundaries, the screw holes will not align. Technical Specification Summary Table Imperial (Inches) Metric (mm) Front Panel Width Horizontal Hole Spacing Internal Rail Clearance Vertical Hole Pitch A Vertical Hole Pitch B Rack Hole Types Covered by the Standard While the standard defines the location of the
Since obtaining the PDF can be costly, here is a detailed breakdown of the most critical dimensions defined in EIA-310-D. These specifications ensure that your 19-inch equipment fits.
0.500 inches (12.70 mm)